MtnBikeMarty--
I called a couple of the companies that sell the rotating bases and asked them why they didn't list and Ford bases past model year 2008 or so. The basic response from the sales people didn't know, but I suspect it has something to do with the airbags. I know Fords have tight cabins but there should be something available.
Then I thought I'm doing it wrong, instead of looking at a class C RV, I should look for a Ford E350 truck and I found a seat base from the Sportsmobile company that would fit, but the price was around $350.
I can wait until I get the unit and take my own measurements. I've modified several vans into campers so I know it can be done, all it may take is a cutting torch, a good drill, and a little creativity.
I'm more concerned in getting a little more recline in the drivers seat. It could be an awful long trip back to Missouri if I have to sit so close to the steering wheel. I have a friend who lives down in Colorado Springs with a pretty good shop and a lot of tools, so that may be my first trip and modification. He used to have an RV so he and I can go over my unit and fix some of the problems that CA don't address.
